Join Portal Error

[OmairChaudhry1]

I have got two fresh installations of Portal on seperate machines. Both have same versions and are authenticated. I have created portal on one of them. For second one when I try to join the existing portal I am getting error of 'unable to generate token from primary machine' (screen shot below). Can anyone has any idea on why the issue is happening. The username and password are correct.

[JonathanQuinn]

You may be using an incorrect URL for the Portal URL. Take the URL entered, append /arcgis/sharing/rest, (https://portal.domain.com:7443/arcgis/sharing/rest), and see if it redirects anywhere. If it does, use the new URL as the Portal URL.